pin comparisons

[larudee@pacbell.net]

All the more justification for oversize pins that are oversize only up to the coils
(4 mm. below the becket) and original size (or smaller) the rest of the way up.

Paul Larudee

John Delacour wrote:

> At 9:24 AM -0800 1/25/02, larudee@pacbell.net wrote:
>
> >It's not just the difference in the amount of string moved per degree of
> >rotation.  It's also the the amount of flex in the pin, the torque exerted by
> >the string tension, and the increased block friction required to overcome that
> >torque.  All of these factors combine to make a difference.
>
> A very important factor to me is the freedom of the string between
> the pin and the top bridge or stud.  On many pianos, even with the
> original pins, there is very little space between the wire and the
> coils of nearby pins.  The piano is often designed with the first pin
> size in mind and no allowance is made for multiple restrings.  There
> is a good reason for this, since to allow for larger pins will entail
> a significant widening of the case.
>
> The result is that if you string with a pin say three sizes up, the
> wire near the pins is going to touch the wires nearby or curve round
> the coil of a nearby pin.  Not only is this ugly but it can also
> interfere with tuning.  That's not to say I'd renew a plank simply to
> avoid this (relatively minor) consideration.
>
> JD